Yesterday I was chatting to another mother from DD's French-English bilingual school on the bus. She has two daughters, one in DD's year, who will soon be 5, and another one three years above, who is 7.
This mother told me that during the summer holidays her 7 year old, who has been having private Chinese lessons for the past year (in addition to having an American nanny to teach her English), is being sent to stay, alone, for a fortnight with a Chinese family in China in order to practise the language.